As the scan of two pages from a book on the Jewish Qabalah attests, the exact same black and white hexagram that's used in Freemasonry is also used by Kabbalists and has the same meaning. The scan above is from Gonzalez Whippler's book "Kabbalah for the Modern World", where she describes the same symbol in the same way as it's described in Freemasonry; that is, the downward triangle represents water, the upward triangle represents fire, i.e., the triangles represent opposite principles in nature. According to the Lexicon of Freemasonry, the "Talmudists say that it was inscribed on the foundation stone of the Temple." (Lexicon of Freemasonry, page 432, Albert Mackey, 33rd Degree Freemason) This would also seem to suggest the significance of the Seal of Solomon in Judaism.